Perhaps you should try some spelling variations:
cong thanh » dong thanh, cong trinh, cong tan
hieu manh » chieu xanh, hieu nganh, dieu hanh
trung cua » truong cua, trung tuan, trung cap
trung cau » trung cap, trung ca, trung can
nang cong » nang song, dang cong, bang cong
hoc hieu » hoc thieu, hoc hien, doc hieu
than cau » toan cau, phan cau, thanh chau
than cap » khan cap, thanh lap, thanh cac

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hieu manh - thanh ((trung cua) or (trung cau)) nang cong thanh ((than cau) OR (than cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - thanh ((trung cua) OR (trung cau)) nang cong thanh ((than cau) OR (than cap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu manh - thanh ((trung cua) or (trung cau)) nang cong thanh ((than cau) OR (than cap))".
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - thanh ((trung cua) or (trung cau)) nang cong thanh ((than cau) OR (than cap))*.